Impact of a vortex ring on a density interface using a regularized inviscid vortex sheet method

Mark J. Stock, Werner J.A. Dahm, Grétar Tryggvason

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

A new, fully three-dimensional, vortex-in-cell method designed to follow the unsteady motion of inviscid vortex sheets with or without small (Boussinesq) density discontinuities is presented. As is common in front-tracking methods, the vortex sheet is described by a moving, unstructured mesh consisting of points connected by triangular elements. Each element carries scalar-valued circulations on its three edges, which can be used to represent any tangent vector value and in the present method represent the element's vorticity. As the interface deforms, nodes and elements are added and removed to maintain the resolution of the sheet and of the vortex sheet strength. The discretization and remeshing methods allow automatic, near-perfect conservation of circulation despite repeated stretching and folding of the interface. Results are compared with previous experiments and simulations. Similarities are observed between the present simulations and experiments of a vortex ring impacting a wall.

Original languageEnglish (US)
Pages (from-to)9021-9043
Number of pages23
JournalJournal of Computational Physics
Volume227
Issue number21
DOIs
StatePublished - Nov 10 2008
Externally publishedYes

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Keywords

  • Density discontinuity
  • Stratified flow
  • Vortex methods
  • Vortex sheet dynamics
  • Vortex-in-cell

ASJC Scopus subject areas

  • Numerical Analysis
  • Modeling and Simulation
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Computer Science Applications
  • Computational Mathematics
  • Applied Mathematics

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